CN206469684U - A kind of individual layer heating for being used to be reduced directly the mode of production and heat reclamation type rotary hearth furnace - Google Patents
A kind of individual layer heating for being used to be reduced directly the mode of production and heat reclamation type rotary hearth furnace Download PDFInfo
- Publication number
- CN206469684U CN206469684U CN201621051680.0U CN201621051680U CN206469684U CN 206469684 U CN206469684 U CN 206469684U CN 201621051680 U CN201621051680 U CN 201621051680U CN 206469684 U CN206469684 U CN 206469684U
- Authority
- CN
- China
- Prior art keywords
- furnace
- rotary hearth
- zone
- hearth furnace
- annular
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000010438 heat treatment Methods 0.000 title claims abstract description 51
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 27
- 239000000463 material Substances 0.000 claims abstract description 71
- 238000001035 drying Methods 0.000 claims abstract description 34
- 238000007599 discharging Methods 0.000 claims abstract description 21
- 230000005540 biological transmission Effects 0.000 claims abstract description 14
- 230000009467 reduction Effects 0.000 claims description 67
- 239000007789 gas Substances 0.000 claims description 19
- 239000000779 smoke Substances 0.000 claims description 17
- 238000005192 partition Methods 0.000 claims description 12
- 239000002918 waste heat Substances 0.000 claims description 10
- 238000011084 recovery Methods 0.000 claims description 9
- 239000002356 single layer Substances 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 7
- 239000003546 flue gas Substances 0.000 claims description 7
- 238000005485 electric heating Methods 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 19
- 230000008569 process Effects 0.000 abstract description 14
- 238000005265 energy consumption Methods 0.000 abstract description 9
- 229910000831 Steel Inorganic materials 0.000 abstract description 2
- 238000005272 metallurgy Methods 0.000 abstract description 2
- 239000010959 steel Substances 0.000 abstract description 2
- 239000000446 fuel Substances 0.000 description 20
- 230000000694 effects Effects 0.000 description 14
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 10
- 239000008188 pellet Substances 0.000 description 8
- 239000002994 raw material Substances 0.000 description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 229910052799 carbon Inorganic materials 0.000 description 6
- 239000010410 layer Substances 0.000 description 6
- 239000000843 powder Substances 0.000 description 6
- 238000002485 combustion reaction Methods 0.000 description 5
- 239000013078 crystal Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 239000003345 natural gas Substances 0.000 description 5
- 239000002352 surface water Substances 0.000 description 5
- 238000009825 accumulation Methods 0.000 description 4
- 238000005453 pelletization Methods 0.000 description 4
- 239000003034 coal gas Substances 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- 238000004904 shortening Methods 0.000 description 3
- 239000003245 coal Substances 0.000 description 2
- 238000003795 desorption Methods 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 230000009970 fire resistant effect Effects 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000011946 reduction process Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 238000001465 metallisation Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000024121 nodulation Effects 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Landscapes
- Tunnel Furnaces (AREA)
Abstract
The utility model is related to steel industry and coloured industry using direct-reduction manufacturing technique method and equipment, belongs to field of metallurgy, and in particular to a kind of individual layer heating for being used to be reduced directly the mode of production and heat reclamation type rotary hearth furnace.The rotary hearth furnace includes annular body of heater, rotatable ring-shaped furnace bottom, heat power engineering system and furnace bottom support and transmission system；Wherein, the annular body of heater includes：Annular furnace, vibration material distributor and discharging machine, wherein, the vibration material distributor includes material distributing machine main body, vibrating spring and vibrating motor；The heat power engineering system includes：Multiple drying tubes and multiple burners；The furnace bottom support and transmission system be arranged on the preheating zone and the reducing zone on the base of the rotatable ring-shaped furnace bottom bottom.The rotary hearth furnace has the advantages that handling process is short, equipment investment is low, equipment operation rate is high, energy consumption is low, had wide range of applications.
Description
Technical Field
The utility model relates to a direct reduction production process method and equipment adopted in the steel industry and the nonferrous industry, which belongs to the metallurgy field, in particular to a single-layer heating and heat recovery type rotary hearth furnace for a direct reduction production mode.
Background
Nowadays, there are various coal-based direct reduction processes, wherein the rotary hearth furnace reduction process has attracted extensive attention because of its advantages of simple equipment, easy operation, short production period, fast reaction speed, environmental friendliness, etc. The basic principle of the rotary hearth furnace iron making is that the metal oxide in the carbon-containing pellets is reduced at high temperature by burning through a flat flame burner positioned on the side wall of the furnace and transmitting the high temperature of the flame to the pellets on the surface of the material feeding layer through radiation, the heating energy mostly adopts natural gas, cracked gas, coke oven gas, converter gas, coal gas and the like, and the energy source is very wide. The process for Directly Reducing Iron (DRI) by adopting rotary hearth furnace equipment mainly comprises the following steps: uniformly mixing iron ore powder and reducing agent coal powder, pressing into carbon-containing pellets, and drying; and uniformly spreading the dried carbon-containing pellets on a rotary hearth furnace, and reducing the carbon-containing pellets in a reduction area (the temperature can reach 1100-1400 ℃) in the rotary hearth furnace for 15-30 min to obtain the metallized pellets with the metallization rate of more than 85%. The rotary hearth furnace apparatus for producing DRI has the advantages of high reduction temperature, short reduction time, and relative stationarity of furnace charge and furnace bottom, thus avoiding the problems of rotary kiln, fluidized bed adhesion, shaft furnace nodulation, etc. However, most of the prior art adopting the rotary hearth furnace to directly reduce more mature processes is that the raw materials are pretreated and then distributed into the rotary hearth furnace after being dried, the pretreatment process before the reduction of the rotary hearth furnace is complex, the production process flow is long, the equipment investment is large, the production cost is high, the energy consumption is high, and the like. The patent of chinese patent No. CN102304600B provides a rotary hearth furnace for the 2~3 sections of cloth and ejection of compact of direct reduction production mode, including annular furnace body and rotatable annular stove bottom, annular furnace body comprises 2~3 sections of arc furnace, and thermotechnical control system includes coal gas nozzle and overgrate air nozzle, coal gas nozzle and overgrate air nozzle interval in proper order, and the symmetry sets up arc furnace wall, after the raw materials pelletization, will give birth to the pelletizing and evenly arrange at the rotary hearth furnace stove bottom through the distributing machine, finally obtain the metallized pelletizing. The utility model discloses a thermotechnical control system all adopts nozzle heating methods, and the material is easily produced the dust in transportation and cloth initial stage and blocks up the nozzle, influences production and moves in the same direction as usual, and the raw materials need pelletizing to be dried before going into the stove, and the technology is complicated, and equipment investment is high. Therefore, how to design a rotary hearth furnace with short process flow, low equipment investment, high equipment operation rate and low energy consumption becomes a technical problem which needs to be solved urgently in the field.
SUMMERY OF THE UTILITY MODEL
The utility model provides a single-layer heating and heat recovery formula rotary hearth furnace for direct reduction mode of production to prior art's not enough. The rotary hearth furnace has the advantages of short treatment flow, low equipment investment, high equipment operation rate, low energy consumption, wide application range and the like.
In order to solve the technical problem, the utility model discloses a technical scheme does:
the utility model provides a single-layer heating and heat recovery type rotary hearth furnace for a direct reduction production mode. According to the embodiment of the utility model, the rotary hearth furnace comprises an annular furnace body, a rotatable annular furnace bottom, a thermal system, a furnace bottom bracket and a transmission system; wherein, annular furnace body includes: the annular hearth consists of an annular furnace wall, a furnace top, a preheating zone, a reduction zone partition wall and a discharge end retaining wall which are sequentially adjacent to each other, and a feeding zone, a preheating zone, a reduction zone and a discharge zone are formed, wherein the retaining wall is positioned between the preheating zone and the reduction zone, the discharge end retaining wall is positioned between the reduction zone and the discharge zone, and the retaining wall both extend downwards from the top wall of the rotary hearth furnace and keep a certain interval with the rotatable annular furnace bottom; two ends of the annular hearth are provided with an independent vibrating material distributor for feeding and a discharging machine for discharging, wherein the vibrating material distributor comprises a material distributor main body, a vibrating spring and a vibrating motor; the thermal system comprises: the drying tubes are arranged on the side wall of the furnace wall of the preheating zone between the rotatable annular furnace bottom and the furnace top and are used for heating the preheating zone in a drying tube mode; the burner is arranged on the side wall of the furnace wall of the reduction region and used for heating the reduction region in a burner mode; the furnace bottom support and the transmission system are arranged on the bases of the preheating zone and the reduction zone, which are positioned at the lower part of the rotatable annular furnace bottom.
The inventor finds that according to the rotary hearth furnace provided by the embodiment of the utility model, the drying tube preheating zone is additionally arranged in the furnace, and partition walls are arranged between the preheating zone and the reduction zone, compared with the traditional rotary hearth furnace which adopts a furnace wall side wall burner heating mode, the problem of burner blockage caused by more powder in the initial stage of material entering the furnace is effectively solved; the utility model adopts the wet lump material or wet ball to directly enter the rotary hearth furnace to process the raw material, thereby shortening the process flow, and reducing the equipment investment, the production cost and the production energy consumption; the utility model discloses rotary hearth furnace adopts heat accumulation formula combustion technology, uses inferior or low-quality fuel, has reduced the fuel cost, can promote at internal and the area that lacks natural gas and high-quality fuel.
According to the embodiment of the utility model, the preheating zone heating temperature is 400 ℃ -1000 ℃.
According to the utility model discloses an embodiment, drying tube heating methods is electrical heating, gas heating, one or several kinds of high temperature flue gas waste heat.
According to the embodiment of the utility model, the horizontal section of the rotary hearth furnace is circular, and the included angle of the circular ring in the preheating zone is 30-100 degrees.
According to an embodiment of the present invention, the feeding zone, the preheating zone, the reduction zone and the discharge zone are arranged in sequence along the rotation direction of the rotatable annular furnace bottom.
According to the utility model discloses an embodiment, the drying tube is located apart from 1/3 interval departments at the bottom of rotatable annular stove, the interval does distance between the bottom of rotatable annular stove and the furnace roof.
According to the utility model discloses an embodiment, be equipped with the exhaust port on the preheating zone brickwork, the flue gas is followed in the stove the exhaust port discharges, and flue gas waste heat is retrieved again for preheat combustion-supporting wind of gas and overgrate air.
According to the utility model discloses an embodiment rotatable annular stove bottom lower surface with the outer circumference department that annular furnace wall corresponds is equipped with the stove bottom water seal groove that is used for stove bottom sealing.
The utility model discloses following beneficial effect has at least:
1. compare with the mode that traditional rotary hearth furnace all adopted the heating of furnace wall lateral wall nozzle, the utility model discloses an add the drying tube preheating zone in the rotary hearth furnace and set up the partition wall between preheating zone and reduction interval, effectively solved the material and gone into the stove initial stage because of the powder leads to the problem of nozzle jam more.
2. The utility model discloses can adopt wet lump material or wet ball direct access rotary hearth furnace's flow to handle the raw materials, shorten process flow, reduce equipment investment, manufacturing cost and production energy consumption.
3. The utility model discloses rotary hearth furnace can adopt heat accumulation formula combustion technology, can use inferior quality or low-quality fuel, has reduced the fuel cost, can promote at internal and the area that lacks natural gas and high-quality fuel.
Drawings
FIG. 1 is a schematic top view of a rotary hearth furnace according to the present invention.
Fig. 2 is a schematic sectional view of the rotary hearth according to the present invention.
FIG. 3 is a schematic elevation view of the rotary hearth furnace of the present invention.
The device comprises a feeding area 1, a preheating area 2, a reduction area 3, a discharging area 4, a smoke outlet 5, a preheating area and reduction area partition wall 6, a discharging end retaining wall 7, a drying pipe 8, a burner 9, a vibrating distributor 10, a vibrating spring 11, a vibrating motor 12, a discharging machine 13, a furnace top 14, an annular furnace wall 15, a furnace bottom water seal tank 16, a material layer 17, a rotatable annular furnace bottom 18, a furnace bottom support and transmission system 19 and a base 20.
Detailed Description
In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the following specific embodiments. The following description of the embodiments is merely exemplary in nature and is in no way intended to limit the invention.
The utility model provides a single-layer heating and heat recovery type rotary hearth furnace for a direct reduction production mode. According to the embodiment of the utility model, fig. 1 is the utility model discloses rotary hearth furnace's schematic view overloads, fig. 2 is the utility model discloses rotary hearth furnace's section schematic view, it is shown with reference to fig. 1 and fig. 2, this rotary hearth furnace includes: the furnace comprises an annular furnace body, a rotatable annular furnace bottom 18, a thermal system, a furnace bottom bracket and a transmission system 19; wherein, annular furnace body includes: the furnace comprises an annular hearth, a vibrating distributor 10 and a discharging machine 13, wherein the annular hearth consists of an annular furnace wall 15, a furnace top 14, a preheating zone and reduction zone partition wall 6 and a discharging end retaining wall 7, and the partition wall and the retaining wall both extend downwards from the top wall of the rotary hearth furnace and keep a certain interval with the rotary annular furnace bottom; two ends of the annular hearth are provided with an independent vibrating material distributor for feeding and a discharging machine for discharging, wherein the vibrating material distributor comprises a material distributor main body, a vibrating spring 11 and a vibrating motor 12; the thermal system comprises: the drying tubes 8 and the burners 9 are arranged on the side wall of the furnace wall of the preheating zone between the rotatable annular furnace bottom and the furnace top and are used for heating the preheating zone in a drying tube mode; the burner is arranged on the side wall of the furnace wall of the reduction region and used for heating the reduction region in a burner mode; the hearth support and drive system 19 is located on the base 20 of the preheating zone and the reduction zone below the rotatable annular hearth.
The inventor finds that according to the rotary hearth furnace provided by the embodiment of the utility model, the drying tube preheating zone is additionally arranged in the furnace, and partition walls are arranged between the preheating zone and the reduction zone, compared with the traditional rotary hearth furnace which adopts a furnace wall side wall burner heating mode, the problem of burner blockage caused by more powder in the initial stage of material entering the furnace is effectively solved; the utility model adopts the wet lump material or wet ball to directly enter the rotary hearth furnace to process the raw material, thereby shortening the process flow, and reducing the equipment investment, the production cost and the production energy consumption; the utility model discloses rotary hearth furnace adopts heat accumulation formula combustion technology, uses inferior or low-quality fuel, has reduced the fuel cost, can promote at internal and the area that lacks natural gas and high-quality fuel.
According to the utility model discloses an embodiment, the concrete shape of rotary hearth furnace's horizontal cross-section is unrestricted, according to the utility model discloses a some embodiments, the utility model discloses preferably ring shape, preheating zone ring contained angle is preferred 30-100, the utility model discloses rotary hearth furnace drying tube preheating zone ring contained angle should not be less than 30, if the ring contained angle is less than 30, then the material is too short in preheating zone retention time, can lead to the material moisture desorption incomplete, and remaining moisture influences the material district reducibility in the reducing zone desorption, reduces valuable metal's reduction ratio, nevertheless is too big to influence the reduction effect of reducing zone material when rotary hearth furnace preheating zone ring contained angle, so control preheating zone ring contained angle is not more than 100.
FIG. 3 is a schematic elevation view of a rotary hearth furnace according to an embodiment of the present invention, as shown in FIG. 3, the feeding zone 1, the preheating zone 2 with the heating temperature of 400-1000 ℃, the reduction zone 3 and the discharging zone 4 which are sequentially adjacent in the annular hearth are sequentially arranged along the rotation direction of the rotatable annular furnace bottom, wherein the preheating zone and the reduction zone partition wall are positioned between the preheating zone and the reduction zone, the discharge end retaining wall is positioned between the reduction zone and the discharge zone, according to the embodiment of the utility model, the partition wall is arranged between the preheating zone and the reduction zone, so that dust generated in the initial stage of charging materials into the reduction zone can be prevented from entering the reduction zone to influence the smooth production, and in addition, the retaining wall is arranged at the discharge end to form a semi-closed structure with the reduction zone, so that the reduction atmosphere of the whole reduction zone can be effectively ensured, and the metal reduction effect is improved.
According to the embodiment of the utility model, the utility model adds the preheating area of the drying tube in the rotary hearth furnace, the drying tube is arranged on the side wall of the furnace wall at the distance from 1/3 between the rotatable furnace bottom and the furnace top, the convection heating effect in the furnace is affected when the drying tube is arranged too close to the furnace bottom material, the radiation heat transfer effect is poor when the drying tube is too far away from the material, and the heat loss is larger when the drying tube is close to the furnace top; the raw materials are preheated by adopting a thermal radiation mode, compared with the traditional rotary hearth furnace which adopts a furnace wall side wall burner heating mode, the problem that the burner is easily blocked due to the fact that a material distribution port has a certain height difference between the top of an annular space of the rotary hearth furnace and the bottom of the furnace in the initial furnace entering stage of the materials is large in dust amount is effectively solved, the heating temperature of a drying pipe is 400-1000 ℃, the mixed materials can be preheated, surface water and crystal water in the materials entering the furnace can be effectively removed, wet lump materials or wet pellets can be directly entered into the furnace on the premise of not influencing product indexes, the process of pressing and drying pellets in front of the rotary hearth furnace is reduced, the process flow is shortened, the equipment investment is reduced, and the rotary hearth furnace has the advantages of short treatment flow, low equipment investment, high equipment operation rate, low energy consumption, wide application range and the like.
During operation, materials are uniformly distributed at the bottom of the rotary hearth furnace through the vibrating distributor 10 of the feeding area 1 of the rotary hearth furnace to form a material layer 17, the bottom of the rotary hearth furnace is driven to rotate through a bottom support and a transmission system 19, the materials do not move relatively to the bottom of the rotary hearth furnace, the materials sequentially pass through the preheating area 2 and the reduction area 3 in a hearth along with the rotation of the bottom of the rotary hearth furnace, a drying pipe preheating area is additionally arranged in the rotary hearth furnace, an electric heating mode is adopted, the heating temperature is 400-1000 ℃, surface water and crystal water in the materials entering the rotary hearth furnace can be effectively removed, and carbon burning loss in the materials is reduced; the reduction zone adopts an inner side wall and outer side wall heat accumulating type burner heating mode, inferior or low-quality fuel can be used, the fuel cost is reduced, the material reduction effect is improved, the reduced material generated after reduction is discharged out of the rotary hearth furnace through a discharging machine 13 of a rotary hearth furnace discharging zone 4, smoke in the furnace is discharged from a smoke outlet 5, smoke waste heat is recycled to preheat gas combustion-supporting air and secondary air required by the rotary hearth furnace, and the preheated gas combustion-supporting air and secondary air are connected to a heating device of the rotary hearth furnace through pipelines.
According to the utility model discloses an embodiment, be equipped with exhaust port 5 on the preheating zone brickwork, the flue gas is followed in the stove the exhaust port discharges, and flue gas waste heat is retrieved again for preheat combustion-supporting wind of gas and overgrate air.
According to the utility model discloses an embodiment, the specific material of preheating zone and reduction zone partition wall is unrestricted, as long as can play the divided effect can, can be for resistant firebrick or fire-resistant knot material etc. according to the utility model discloses a some embodiments, the utility model discloses preferably be resistant firebrick.
According to the utility model discloses an embodiment, the concrete material of discharge end barricade is unrestricted, as long as can play the effect that blocks can, can be for resistant firebrick or fire-resistant knot material etc. according to the utility model discloses a some embodiments, the utility model discloses preferably be resistant firebrick.
According to the utility model discloses an embodiment, the drying tube is located apart from 1/3 interval departments at rotatable annular stove bottom, the interval does distance between rotatable annular stove bottom and the furnace roof, the specific number and the shape of drying tube and nozzle are unrestricted, as long as can play the effect of dry heating can, wherein, the shape of drying tube can be for P shape, W shape or U type, according to the utility model discloses a some embodiments, the utility model discloses the preferred U type of drying tube, the specific heating mode of drying tube is unrestricted, according to the utility model discloses a some embodiments, the utility model discloses preferably one or several kinds of electrical heating, gas heating, high temperature flue gas waste heat.
According to the utility model discloses an embodiment, vibrating motor's specific model is unrestricted, as long as can play the vibration material and with its vibration to the effect in the stove can.
According to the embodiment of the utility model, the concrete component of stove bottom support and transmission system is unrestricted, as long as can play support and driven effect can, stove bottom support and transmission system's the preferred 2-4 sets of number of sets set sets up respectively on the base of rotatable annular stove bottom lower part.
According to the utility model discloses an embodiment, the concrete kind of base at rotatable annular stove bottom is unrestricted, as long as can play the effect of support can, according to the utility model discloses a some embodiments, the utility model discloses preferred base is by the cylinder capable metal body of two parallels through the welding the lower part at rotatable annular stove bottom forms.
According to the utility model discloses an embodiment rotatable annular stove bottom lower surface with the outer circumference department that annular furnace wall corresponds is equipped with the stove bottom water seal groove 16 that is used for stove bottom sealing.
Example 1: as shown in fig. 1, 2 and 3, a single-layer heating and heat recovery type rotary hearth furnace for a direct reduction production manner, the diameter of the rotary hearth furnace being 40m to 60 m; during operation, materials are uniformly distributed at the bottom of the rotary hearth furnace through the vibrating distributor 10 of the feeding area 1 of the rotary hearth furnace to form a material layer 17, the bottom of the rotary hearth furnace is driven to rotate through a bottom support and a transmission system 19, the materials and the bottom of the rotary hearth furnace do not move relatively, the materials sequentially pass through the preheating area 2 and the reduction area 3 in a hearth along with the rotation of the bottom of the rotary hearth furnace, the preheating area of a drying pipe is additionally arranged in the rotary hearth furnace, the included angle of a circular ring of the preheating area is 30 degrees, an electric heating mode is adopted, the heating temperature is 800-1000 ℃, surface water and crystal water in the materials entering the rotary hearth furnace can be effectively removed; the reduction zone adopts an inner side wall and outer side wall heat accumulating type burner heating mode, inferior or low-quality fuel can be used, the fuel cost is reduced, the material reduction effect is improved, the reduced material generated after reduction is discharged out of the rotary hearth furnace through a discharging machine 13 of a rotary hearth furnace discharging zone 4, smoke in the furnace is discharged from a smoke outlet 5, smoke waste heat is recycled to preheat gas combustion-supporting air and secondary air required by the rotary hearth furnace, and the preheated gas combustion-supporting air and secondary air are connected to a heating device of the rotary hearth furnace through pipelines.
Example 2: as shown in fig. 1, 2 and 3, a single-layer heating and heat recovery type rotary hearth furnace for a direct reduction production manner, the diameter of the rotary hearth furnace being 40m to 60 m; during operation, materials are uniformly distributed at the bottom of the rotary hearth furnace through the vibrating distributor 10 of the feeding area 1 of the rotary hearth furnace to form a material layer 17, the bottom of the rotary hearth furnace is driven to rotate through a bottom support and a transmission system 19, the materials and the bottom of the rotary hearth furnace do not move relatively, the materials sequentially pass through the preheating area 2 and the reduction area 3 in a hearth along with the rotation of the bottom of the rotary hearth furnace, the preheating area of a drying pipe is additionally arranged in the rotary hearth furnace, the included angle of a circular ring of the preheating area is 60 degrees, an electric heating mode is adopted, the heating temperature is 600-1000 ℃, surface water and crystal water in the materials entering the rotary hearth furnace can be effectively removed; the reduction zone adopts an inner side wall and outer side wall heat accumulating type burner heating mode, inferior or low-quality fuel can be used, the fuel cost is reduced, the material reduction effect is improved, the reduced material generated after reduction is discharged out of the rotary hearth furnace through a discharging machine 13 of a rotary hearth furnace discharging zone 4, smoke in the furnace is discharged from a smoke outlet 5, smoke waste heat is recycled to preheat gas combustion-supporting air and secondary air required by the rotary hearth furnace, and the preheated gas combustion-supporting air and secondary air are connected to a heating device of the rotary hearth furnace through pipelines.
Example 3: as shown in fig. 1, 2 and 3, a single-layer heating and heat recovery type rotary hearth furnace for a direct reduction production manner, the diameter of the rotary hearth furnace being 40m to 60 m; during operation, materials are uniformly distributed at the bottom of the rotary hearth furnace through the vibrating distributor 10 of the feeding area 1 of the rotary hearth furnace to form a material layer 17, the bottom of the rotary hearth furnace is driven to rotate through a bottom support and a transmission system 19, the materials and the bottom of the rotary hearth furnace do not move relatively, the materials sequentially pass through the preheating area 2 and the reduction area 3 in a hearth along with the rotation of the bottom of the rotary hearth furnace, the preheating area of a drying pipe is additionally arranged in the rotary hearth furnace, the circular included angle of the preheating area is 100 degrees, a gas combustion heating mode is adopted, the heating temperature is 400-1000 ℃, surface water and crystal water in the materials entering the rotary hearth furnace can be effectively removed, and the carbon; the reduction zone adopts an inner side wall and outer side wall heat accumulating type burner heating mode, inferior or low-quality fuel can be used, the fuel cost is reduced, the material reduction effect is improved, the reduced material generated after reduction is discharged out of the rotary hearth furnace through a discharging machine 13 of a rotary hearth furnace discharging zone 4, smoke in the furnace is discharged from a smoke outlet 5, smoke waste heat is recycled to preheat gas combustion-supporting air and secondary air required by the rotary hearth furnace, and the preheated gas combustion-supporting air and secondary air are connected to a heating device of the rotary hearth furnace through pipelines.
The inventor finds that according to the rotary hearth furnace provided by the embodiment of the utility model, the drying tube preheating zone is additionally arranged in the furnace, and partition walls are arranged between the preheating zone and the reduction zone, compared with the traditional rotary hearth furnace which adopts a furnace wall side wall burner heating mode, the problem of burner blockage caused by more powder in the initial stage of material entering the furnace is effectively solved; the utility model adopts the wet lump material or wet ball to directly enter the rotary hearth furnace to process the raw material, thereby shortening the process flow, and reducing the equipment investment, the production cost and the production energy consumption; the utility model discloses rotary hearth furnace adopts heat accumulation formula combustion technology, uses inferior or low-quality fuel, has reduced the fuel cost, can promote at internal and the area that lacks natural gas and high-quality fuel.
In the description of the present invention, it is to be understood that the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that various changes, modifications, substitutions and alterations can be made in the above embodiments by those skilled in the art without departing from the scope of the present invention, and that various changes in the detailed description and applications can be made by those skilled in the art without departing from the spirit of the present invention.
Claims (7)
1. A single-layer heating and heat recovery type rotary hearth furnace for a direct reduction production mode is characterized by comprising an annular furnace body, a rotatable annular furnace bottom, a thermal system, a furnace bottom bracket and a transmission system; wherein,
the annular furnace body includes: the annular hearth consists of an annular furnace wall, a furnace top, a preheating zone, a reducing zone partition wall and a discharge end retaining wall, and a feeding zone, a preheating zone, a reducing zone and a discharge zone which are adjacent in sequence are formed, wherein a smoke exhaust port is formed in the furnace wall of the preheating zone, smoke in the furnace is exhausted from the smoke exhaust port, waste heat of the smoke is recycled and is used for preheating combustion-supporting gas and secondary air, the preheated combustion-supporting gas and the preheated secondary air are connected to a heating device of the rotary hearth furnace through pipelines, the retaining wall is positioned between the preheating zone and the reducing zone, the discharge end retaining wall is positioned between the reducing zone and the discharge zone, and the reducing zone forms a semi-closed structure, and the retaining wall both extend downwards from the top wall of the rotary hearth furnace and keep a certain interval with the rotatable annular furnace bottom; two ends of the annular hearth are provided with an independent vibrating material distributor for feeding and a discharging machine for discharging, wherein the vibrating material distributor comprises a material distributor main body, a vibrating spring and a vibrating motor;
the thermal system comprises: the drying tubes are arranged on the side wall of the furnace wall of the preheating zone between the rotatable annular furnace bottom and the furnace top and are used for heating the preheating zone in a drying tube mode; the burner is arranged on the side wall of the furnace wall of the reduction region and used for heating the reduction region in a burner mode;
the furnace bottom support and the transmission system are arranged on bases of the preheating zone and the reduction zone, which are positioned at the lower part of the rotatable annular furnace bottom, and the bases are formed by welding two parallel cylindrical metal bodies at the lower part of the rotatable annular furnace bottom.
2. The rotary hearth furnace according to claim 1, wherein the preheating zone is heated at a temperature of 400 ℃ to 1000 ℃.
3. The rotary hearth furnace according to claim 1, wherein the drying tube heating mode is one or more of electric heating, gas heating and high-temperature flue gas waste heat.
4. The rotary hearth furnace according to claim 1, wherein the horizontal cross section of the rotary hearth furnace is circular and the included angle of the circular ring of the preheating zone is 30 ° to 100 °.
5. A rotary hearth furnace according to claim 1, characterized in that the charging zone, the preheating zone, the reduction zone and the discharge zone are arranged in succession in the direction of rotation of the rotatable annular hearth.
6. The rotary hearth furnace of claim 1 wherein said drying duct is located at a distance from said rotatable annular hearth 1/3, said distance being the distance between said rotatable annular hearth and the top of the furnace.
7. The rotary hearth furnace according to claim 1, wherein a hearth water seal groove for hearth sealing is provided at an outer circumference of a lower surface of said rotatable annular hearth corresponding to said annular furnace wall.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621051680.0U CN206469684U (en) | 2016-09-13 | 2016-09-13 | A kind of individual layer heating for being used to be reduced directly the mode of production and heat reclamation type rotary hearth furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621051680.0U CN206469684U (en) | 2016-09-13 | 2016-09-13 | A kind of individual layer heating for being used to be reduced directly the mode of production and heat reclamation type rotary hearth furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206469684U true CN206469684U (en) | 2017-09-05 |
Family
ID=59709316
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621051680.0U Expired - Fee Related CN206469684U (en) | 2016-09-13 | 2016-09-13 | A kind of individual layer heating for being used to be reduced directly the mode of production and heat reclamation type rotary hearth furnace |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206469684U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107619896A (en) * | 2017-09-27 | 2018-01-23 | 昆明理工大学 | A kind of method added calcium powder and improve v-ti magnetite concentrate direct-reduction efficiency |
-
2016
- 2016-09-13 CN CN201621051680.0U patent/CN206469684U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107619896A (en) * | 2017-09-27 | 2018-01-23 | 昆明理工大学 | A kind of method added calcium powder and improve v-ti magnetite concentrate direct-reduction efficiency |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102295282B (en) | Carbonization-activation integral furnace | |
| CN106288781A (en) | A kind of monolayer for being reduced directly the mode of production heats and heat reclamation type rotary hearth furnace | |
| CN101956037B (en) | Method and device for indirect heating type reduction iron making | |
| CN105905894A (en) | Carbonization and activation device for active coke production | |
| CN106916599A (en) | A kind of iron coke process units and method | |
| CN106705655A (en) | Radiant tube type rotary heating device for organic solid waste pyrolysis | |
| CN106197014A (en) | A kind of double-layer heating rotary hearth furnace for being reduced directly the mode of production | |
| CN206469684U (en) | A kind of individual layer heating for being used to be reduced directly the mode of production and heat reclamation type rotary hearth furnace | |
| CN103482889B (en) | Heat accumulating type material calcinating device | |
| CN102443445B (en) | Process and device for continuously gasifying biomass and simultaneously removing tar in moving bed | |
| CN104694138A (en) | Hybrid heating equipment and application thereof | |
| CN104817084B (en) | calcium carbide smelting furnace | |
| CN202297141U (en) | Carbonization and activation integrated furnace | |
| CN202214340U (en) | Continuous gasification and tar removing device for biomass moving bed | |
| CN201522188U (en) | Flame-isolated rotary kiln for calcining dolomite | |
| CN206469683U (en) | A kind of double-layer heating and frequency modulation type rotary hearth furnace for being used to be reduced directly the mode of production | |
| CN104108715A (en) | Efficient and energy-saving carbonization and activation integrated furnace | |
| CN203728869U (en) | Coal-based direct-reduction iron-making device using vertical tank | |
| CN2847195Y (en) | High temperature rotary kiln | |
| CN113072310B (en) | Lime kiln and lime preparation method | |
| CN204574771U (en) | A kind of vertical sponge iron sintering equipment | |
| CN206469672U (en) | A kind of double-layer heating rotary hearth furnace for being used to be reduced directly the mode of production | |
| CN212375177U (en) | Efficient and environment-friendly tower type mixed combustion light-burning magnesium shaft kiln | |
| CN201952232U (en) | Special shaft kiln equipment for producing kiln process phosphoric acid | |
| CN205328940U (en) | System for pyrolysis coal |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PP01 | Preservation of patent right |
Effective date of registration: 20190102 Granted publication date: 20170905 |
|
| PP01 | Preservation of patent right | ||
| PD01 | Discharge of preservation of patent |
Date of cancellation: 20220102 Granted publication date: 20170905 |
|
| PD01 | Discharge of preservation of patent | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170905 Termination date: 20180913 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |